COMMENT(\s\S+)*\ \#\ Building\ This\ Dockerfile\ builds\ ubuntu\ machine\ with\ sshd\ running\.\ It\ requires\ at\ least\ one\ public\ key\ to\ be\ present\ in\ public\-keys\ directory\.\ Usually\ you\ can\ find\ you\ public\ keys\ in\ \$HOME/\.ssh/\*\.pub\ So\ you\ can\ copy\ them\ with\ command:\.\.\.(\s\S+)*